.go-to-top{position:fixed;bottom:20px;right:20px;background-color:#000;color:#fff;width:40px;height:40px;border-radius:50%;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;z-index:2;transition:opacity .2s ease,visibility .2s ease}.go-to-top.visible{opacity:1;visibility:visible}body.adhesion .go-to-top{margin-bottom:80px}